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x in (-oo:+oo)
(1/5)^3-(3*x) = 1 // - 1
(1/5)^3-(3*x)-1 = 0
(1/5)^3-3*x-1 = 0
-3*x-124/125 = 0 // + 124/125
-3*x = 124/125 // : -3
x = 124/125/(-3)
x = -124/375
x = -124/375
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